""""""""" It's just a method I use when I have problems with the trim"""""""""""""

..i do the same..
i think cutting surface must penetrate into other surface,when last one is complex
i suppose that trim using just a curve project a lot of points,and if the target is ondulated or complicated,tool not project enough points to cover all the wavy:so trim fails.
(this is just my deduction,forgive me if is not correct)
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thanks Burr for your tuts,i learned few fundamental tricks in the past
just don't know why you don't speak also...it's your leanguage!!! (i must do lot of effort to speak in English when i record my modeling sessions...damn...)

Hi Burr, yeah a trim curve that is non-planar goes through a much different process than a planar one, it tries to get the curve onto the surface by a process of pulling it down along the surface normals, but that process in the geometry library only works very well currently if the curve is really pretty close to the surface already. If it's a fair distance away it tends to make squiggles in the curve. I've been planning for quite a while to overhaul that particular "pull down 3D curve to surface" mechanism.

- Michael

""""""just don't know why you don't speak also..""""""""""

I'll try to remember to speak in them. I guess it can help some with alot of the little stuff.....